[sqoop] Correct from and to labels for export or import jobs

sqoop.jobs.js not i18n and kind of hacky.
HUE-1496 [sqoop2] Spinner showing when can't connect
[sqoop2] Fix databind errors when saving and running first job and connection

When a user performs the following steps, the app would have databind errors:
1. Delete all connections and jobs, then refresh the page.
2. Create a new connection with an error, then rectify the error, then save the connection.
3. Create a new job with an error, then rectify the error, then save and run the job.

There is a moment when switching between the job that was being edited and the newly loaded
job that would cause those errors. Also, needed to make sure "isLoading" is set when fetching
new jobs and connections.
HUE-1479 [hbase] Column range scan in search bar
HUE-1480 [hbase] Make column family optional in searchbar
HUE-1491 [hbase] Column Prefix Filter only works for number prefixes
HUE-1483 [hbase] Better cell editor